strptime.c revision 53941
128019Sjoerg/* 228021Sjoerg * Powerdog Industries kindly requests feedback from anyone modifying 328021Sjoerg * this function: 428021Sjoerg * 528021Sjoerg * Date: Thu, 05 Jun 1997 23:17:17 -0400 628021Sjoerg * From: Kevin Ruddy <kevin.ruddy@powerdog.com> 728021Sjoerg * To: James FitzGibbon <james@nexis.net> 828021Sjoerg * Subject: Re: Use of your strptime(3) code (fwd) 928021Sjoerg * 1028021Sjoerg * The reason for the "no mod" clause was so that modifications would 1128021Sjoerg * come back and we could integrate them and reissue so that a wider 1228021Sjoerg * audience could use it (thereby spreading the wealth). This has 1328021Sjoerg * made it possible to get strptime to work on many operating systems. 1428021Sjoerg * I'm not sure why that's "plain unacceptable" to the FreeBSD team. 1528021Sjoerg * 1628021Sjoerg * Anyway, you can change it to "with or without modification" as 1728021Sjoerg * you see fit. Enjoy. 1828021Sjoerg * 1928021Sjoerg * Kevin Ruddy 2028021Sjoerg * Powerdog Industries, Inc. 2128021Sjoerg */ 2228021Sjoerg/* 2328019Sjoerg * Copyright (c) 1994 Powerdog Industries. All rights reserved. 2428019Sjoerg * 2528021Sjoerg * Redistribution and use in source and binary forms, with or without 2628019Sjoerg * modification, are permitted provided that the following conditions 2728019Sjoerg * are met: 2828019Sjoerg * 1. Redistributions of source code must retain the above copyright 2928019Sjoerg * notice, this list of conditions and the following disclaimer. 3028019Sjoerg * 2. Redistributions in binary form must reproduce the above copyright 3128019Sjoerg * notice, this list of conditions and the following disclaimer 3228019Sjoerg * in the documentation and/or other materials provided with the 3328019Sjoerg * distribution. 3428019Sjoerg * 3. All advertising materials mentioning features or use of this 3528019Sjoerg * software must display the following acknowledgement: 3628019Sjoerg * This product includes software developed by Powerdog Industries. 3728019Sjoerg * 4. The name of Powerdog Industries may not be used to endorse or 3828019Sjoerg * promote products derived from this software without specific prior 3928019Sjoerg * written permission. 4028019Sjoerg * 4128019Sjoerg * THIS SOFTWARE IS PROVIDED BY POWERDOG INDUSTRIES ``AS IS'' AND ANY 4228019Sjoerg * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4328019Sjoerg * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 4428019Sjoerg * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE POWERDOG INDUSTRIES BE 4528019Sjoerg * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 4628019Sjoerg * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 4728019Sjoerg * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 4828019Sjoerg * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 4928019Sjoerg * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 5028019Sjoerg * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 5128019Sjoerg * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 5228019Sjoerg */ 5328019Sjoerg 5428021Sjoerg#ifdef LIBC_RCS 5528021Sjoergstatic const char rcsid[] = 5650476Speter "$FreeBSD: head/lib/libc/stdtime/strptime.c 53941 1999-11-30 08:05:09Z ache $"; 5728021Sjoerg#endif 5828021Sjoerg 5928019Sjoerg#ifndef lint 6028021Sjoerg#ifndef NOID 6128019Sjoergstatic char copyright[] = 6228019Sjoerg"@(#) Copyright (c) 1994 Powerdog Industries. All rights reserved."; 6328021Sjoergstatic char sccsid[] = "@(#)strptime.c 0.1 (Powerdog) 94/03/27"; 6428021Sjoerg#endif /* !defined NOID */ 6528019Sjoerg#endif /* not lint */ 6628019Sjoerg 6728019Sjoerg#include <time.h> 6828019Sjoerg#include <ctype.h> 6928019Sjoerg#include <string.h> 7048614Sobrien#ifdef _THREAD_SAFE 7148614Sobrien#include <pthread.h> 7248614Sobrien#include "pthread_private.h" 7348614Sobrien#endif 7428021Sjoerg#include "timelocal.h" 7528019Sjoerg 7648614Sobrienstatic char * _strptime(const char *, const char *, struct tm *); 7748614Sobrien 7848614Sobrien#ifdef _THREAD_SAFE 7948614Sobrienstatic struct pthread_mutex _gotgmt_mutexd = PTHREAD_MUTEX_STATIC_INITIALIZER; 8048614Sobrienstatic pthread_mutex_t gotgmt_mutex = &_gotgmt_mutexd; 8148614Sobrien#endif 8248614Sobrienstatic int got_GMT; 8348614Sobrien 8428021Sjoerg#define asizeof(a) (sizeof (a) / sizeof ((a)[0])) 8528019Sjoerg 8648614Sobrienstatic char * 8748614Sobrien_strptime(const char *buf, const char *fmt, struct tm *tm) 8828019Sjoerg{ 8928021Sjoerg char c; 9028021Sjoerg const char *ptr; 9128021Sjoerg int i, 9228021Sjoerg len; 9353941Sache int Ealternative, Oalternative; 9428019Sjoerg 9528021Sjoerg ptr = fmt; 9628021Sjoerg while (*ptr != 0) { 9728021Sjoerg if (*buf == 0) 9828021Sjoerg break; 9928019Sjoerg 10028021Sjoerg c = *ptr++; 10128019Sjoerg 10228021Sjoerg if (c != '%') { 10328164Sache if (isspace((unsigned char)c)) 10428164Sache while (*buf != 0 && isspace((unsigned char)*buf)) 10528021Sjoerg buf++; 10628021Sjoerg else if (c != *buf++) 10728021Sjoerg return 0; 10828021Sjoerg continue; 10928021Sjoerg } 11028019Sjoerg 11153941Sache Ealternative = 0; 11253941Sache Oalternative = 0; 11353941Sachelabel: 11428021Sjoerg c = *ptr++; 11528021Sjoerg switch (c) { 11628021Sjoerg case 0: 11728021Sjoerg case '%': 11828021Sjoerg if (*buf++ != '%') 11928021Sjoerg return 0; 12028021Sjoerg break; 12128019Sjoerg 12253941Sache case '+': 12348614Sobrien buf = _strptime(buf, Locale->date_fmt, tm); 12428021Sjoerg if (buf == 0) 12528021Sjoerg return 0; 12628021Sjoerg break; 12728019Sjoerg 12853941Sache case 'C': 12953941Sache if (!isdigit((unsigned char)*buf)) 13053941Sache return 0; 13153941Sache 13253941Sache for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 13353941Sache i *= 10; 13453941Sache i += *buf - '0'; 13553941Sache } 13653941Sache if (i < 19) 13753941Sache return 0; 13853941Sache 13953941Sache tm->tm_year = i * 100 - 1900; 14053941Sache break; 14153941Sache 14228021Sjoerg case 'c': 14353941Sache buf = _strptime(buf, Locale->c_fmt, tm); 14428021Sjoerg if (buf == 0) 14528021Sjoerg return 0; 14628021Sjoerg break; 14728019Sjoerg 14828021Sjoerg case 'D': 14948614Sobrien buf = _strptime(buf, "%m/%d/%y", tm); 15028021Sjoerg if (buf == 0) 15128021Sjoerg return 0; 15228021Sjoerg break; 15328019Sjoerg 15453941Sache case 'E': 15553941Sache Ealternative++; 15653941Sache goto label; 15753941Sache 15853941Sache case 'O': 15953941Sache Oalternative++; 16053941Sache goto label; 16153941Sache 16228021Sjoerg case 'R': 16348614Sobrien buf = _strptime(buf, "%H:%M", tm); 16428021Sjoerg if (buf == 0) 16528021Sjoerg return 0; 16628021Sjoerg break; 16728019Sjoerg 16828021Sjoerg case 'r': 16948614Sobrien buf = _strptime(buf, "%I:%M:%S %p", tm); 17028021Sjoerg if (buf == 0) 17128021Sjoerg return 0; 17228021Sjoerg break; 17328019Sjoerg 17428021Sjoerg case 'T': 17548614Sobrien buf = _strptime(buf, "%H:%M:%S", tm); 17628021Sjoerg if (buf == 0) 17728021Sjoerg return 0; 17828021Sjoerg break; 17928019Sjoerg 18028021Sjoerg case 'X': 18148614Sobrien buf = _strptime(buf, Locale->X_fmt, tm); 18228021Sjoerg if (buf == 0) 18328021Sjoerg return 0; 18428021Sjoerg break; 18528019Sjoerg 18628021Sjoerg case 'x': 18753941Sache buf = _strptime(buf, Ealternative ? Locale->Ex_fmt : Locale->x_fmt, tm); 18828021Sjoerg if (buf == 0) 18928021Sjoerg return 0; 19028021Sjoerg break; 19128019Sjoerg 19228021Sjoerg case 'j': 19328164Sache if (!isdigit((unsigned char)*buf)) 19428021Sjoerg return 0; 19528019Sjoerg 19628164Sache for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 19728021Sjoerg i *= 10; 19828021Sjoerg i += *buf - '0'; 19928021Sjoerg } 20053083Ssheldonh if (i < 1 || i > 366) 20128021Sjoerg return 0; 20228019Sjoerg 20353083Ssheldonh tm->tm_yday = i - 1; 20428021Sjoerg break; 20528019Sjoerg 20628021Sjoerg case 'M': 20728021Sjoerg case 'S': 20828164Sache if (*buf == 0 || isspace((unsigned char)*buf)) 20928021Sjoerg break; 21028019Sjoerg 21128164Sache if (!isdigit((unsigned char)*buf)) 21228021Sjoerg return 0; 21328019Sjoerg 21428164Sache for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 21528021Sjoerg i *= 10; 21628021Sjoerg i += *buf - '0'; 21728021Sjoerg } 21828019Sjoerg 21953083Ssheldonh if (c == 'M') { 22053083Ssheldonh if (i > 59) 22153083Ssheldonh return 0; 22228021Sjoerg tm->tm_min = i; 22353083Ssheldonh } else { 22453083Ssheldonh if (i > 60) 22553083Ssheldonh return 0; 22628021Sjoerg tm->tm_sec = i; 22753083Ssheldonh } 22828019Sjoerg 22928164Sache if (*buf != 0 && isspace((unsigned char)*buf)) 23028164Sache while (*ptr != 0 && !isspace((unsigned char)*ptr)) 23128021Sjoerg ptr++; 23228021Sjoerg break; 23328019Sjoerg 23428021Sjoerg case 'H': 23528021Sjoerg case 'I': 23628021Sjoerg case 'k': 23728021Sjoerg case 'l': 23828164Sache if (!isdigit((unsigned char)*buf)) 23928021Sjoerg return 0; 24028019Sjoerg 24128164Sache for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 24228021Sjoerg i *= 10; 24328021Sjoerg i += *buf - '0'; 24428021Sjoerg } 24528021Sjoerg if (c == 'H' || c == 'k') { 24628021Sjoerg if (i > 23) 24728021Sjoerg return 0; 24828021Sjoerg } else if (i > 11) 24928021Sjoerg return 0; 25028019Sjoerg 25128021Sjoerg tm->tm_hour = i; 25228019Sjoerg 25328164Sache if (*buf != 0 && isspace((unsigned char)*buf)) 25428164Sache while (*ptr != 0 && !isspace((unsigned char)*ptr)) 25528021Sjoerg ptr++; 25628021Sjoerg break; 25728019Sjoerg 25828021Sjoerg case 'p': 25928021Sjoerg len = strlen(Locale->am); 26028021Sjoerg if (strncasecmp(buf, Locale->am, len) == 0) { 26128021Sjoerg if (tm->tm_hour > 12) 26228021Sjoerg return 0; 26328021Sjoerg if (tm->tm_hour == 12) 26428021Sjoerg tm->tm_hour = 0; 26528021Sjoerg buf += len; 26628021Sjoerg break; 26728021Sjoerg } 26828019Sjoerg 26928021Sjoerg len = strlen(Locale->pm); 27028021Sjoerg if (strncasecmp(buf, Locale->pm, len) == 0) { 27128021Sjoerg if (tm->tm_hour > 12) 27228021Sjoerg return 0; 27328021Sjoerg if (tm->tm_hour != 12) 27428021Sjoerg tm->tm_hour += 12; 27528021Sjoerg buf += len; 27628021Sjoerg break; 27728021Sjoerg } 27828019Sjoerg 27928021Sjoerg return 0; 28028019Sjoerg 28128021Sjoerg case 'A': 28228021Sjoerg case 'a': 28328021Sjoerg for (i = 0; i < asizeof(Locale->weekday); i++) { 28428021Sjoerg len = strlen(Locale->weekday[i]); 28528021Sjoerg if (strncasecmp(buf, 28628021Sjoerg Locale->weekday[i], 28728021Sjoerg len) == 0) 28828021Sjoerg break; 28928019Sjoerg 29028021Sjoerg len = strlen(Locale->wday[i]); 29128021Sjoerg if (strncasecmp(buf, 29228021Sjoerg Locale->wday[i], 29328021Sjoerg len) == 0) 29428021Sjoerg break; 29528021Sjoerg } 29628021Sjoerg if (i == asizeof(Locale->weekday)) 29728021Sjoerg return 0; 29828019Sjoerg 29928021Sjoerg tm->tm_wday = i; 30028021Sjoerg buf += len; 30128021Sjoerg break; 30228019Sjoerg 30353083Ssheldonh case 'U': 30453083Ssheldonh case 'W': 30553083Ssheldonh /* 30653083Ssheldonh * XXX This is bogus, as we can not assume any valid 30753083Ssheldonh * information present in the tm structure at this 30853083Ssheldonh * point to calculate a real value, so just check the 30953083Ssheldonh * range for now. 31053083Ssheldonh */ 31153083Ssheldonh if (!isdigit((unsigned char)*buf)) 31253083Ssheldonh return 0; 31353083Ssheldonh 31453083Ssheldonh for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 31553083Ssheldonh i *= 10; 31653083Ssheldonh i += *buf - '0'; 31753083Ssheldonh } 31853083Ssheldonh if (i > 53) 31953083Ssheldonh return 0; 32053083Ssheldonh 32153083Ssheldonh if (*buf != 0 && isspace((unsigned char)*buf)) 32253083Ssheldonh while (*ptr != 0 && !isspace((unsigned char)*ptr)) 32353083Ssheldonh ptr++; 32453083Ssheldonh break; 32553083Ssheldonh 32653083Ssheldonh case 'w': 32753083Ssheldonh if (!isdigit((unsigned char)*buf)) 32853083Ssheldonh return 0; 32953083Ssheldonh 33053083Ssheldonh for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 33153083Ssheldonh i *= 10; 33253083Ssheldonh i += *buf - '0'; 33353083Ssheldonh } 33453083Ssheldonh if (i > 6) 33553083Ssheldonh return 0; 33653083Ssheldonh 33753083Ssheldonh tm->tm_wday = i; 33853083Ssheldonh 33953083Ssheldonh if (*buf != 0 && isspace((unsigned char)*buf)) 34053083Ssheldonh while (*ptr != 0 && !isspace((unsigned char)*ptr)) 34153083Ssheldonh ptr++; 34253083Ssheldonh break; 34353083Ssheldonh 34428021Sjoerg case 'd': 34528021Sjoerg case 'e': 34628164Sache if (!isdigit((unsigned char)*buf)) 34728021Sjoerg return 0; 34828019Sjoerg 34928164Sache for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 35028021Sjoerg i *= 10; 35128021Sjoerg i += *buf - '0'; 35228021Sjoerg } 35328021Sjoerg if (i > 31) 35428021Sjoerg return 0; 35528019Sjoerg 35628021Sjoerg tm->tm_mday = i; 35728019Sjoerg 35828164Sache if (*buf != 0 && isspace((unsigned char)*buf)) 35928164Sache while (*ptr != 0 && !isspace((unsigned char)*ptr)) 36028021Sjoerg ptr++; 36128021Sjoerg break; 36228019Sjoerg 36328021Sjoerg case 'B': 36428021Sjoerg case 'b': 36528021Sjoerg case 'h': 36628021Sjoerg for (i = 0; i < asizeof(Locale->month); i++) { 36753941Sache if (Oalternative) { 36853941Sache if (c == 'B') { 36953941Sache len = strlen(Locale->alt_month[i]); 37053941Sache if (strncasecmp(buf, 37153941Sache Locale->alt_month[i], 37253941Sache len) == 0) 37353941Sache break; 37453941Sache } 37553941Sache } else { 37653941Sache if (c == 'B') { 37753941Sache len = strlen(Locale->month[i]); 37853941Sache if (strncasecmp(buf, 37953941Sache Locale->month[i], 38053941Sache len) == 0) 38153941Sache break; 38253941Sache } else { 38353941Sache len = strlen(Locale->mon[i]); 38453941Sache if (strncasecmp(buf, 38553941Sache Locale->mon[i], 38653941Sache len) == 0) 38753941Sache break; 38853941Sache } 38953941Sache } 39028021Sjoerg } 39128021Sjoerg if (i == asizeof(Locale->month)) 39228021Sjoerg return 0; 39328019Sjoerg 39428021Sjoerg tm->tm_mon = i; 39528021Sjoerg buf += len; 39628021Sjoerg break; 39728019Sjoerg 39828021Sjoerg case 'm': 39928164Sache if (!isdigit((unsigned char)*buf)) 40028021Sjoerg return 0; 40128019Sjoerg 40228164Sache for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 40328021Sjoerg i *= 10; 40428021Sjoerg i += *buf - '0'; 40528021Sjoerg } 40628021Sjoerg if (i < 1 || i > 12) 40728021Sjoerg return 0; 40828019Sjoerg 40928021Sjoerg tm->tm_mon = i - 1; 41028019Sjoerg 41128164Sache if (*buf != 0 && isspace((unsigned char)*buf)) 41228164Sache while (*ptr != 0 && !isspace((unsigned char)*ptr)) 41328021Sjoerg ptr++; 41428021Sjoerg break; 41528019Sjoerg 41628021Sjoerg case 'Y': 41728021Sjoerg case 'y': 41828164Sache if (*buf == 0 || isspace((unsigned char)*buf)) 41928021Sjoerg break; 42028019Sjoerg 42128164Sache if (!isdigit((unsigned char)*buf)) 42228021Sjoerg return 0; 42328019Sjoerg 42428164Sache for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) { 42528021Sjoerg i *= 10; 42628021Sjoerg i += *buf - '0'; 42728021Sjoerg } 42828021Sjoerg if (c == 'Y') 42928021Sjoerg i -= 1900; 43046051Swes if (c == 'y' && i < 69) 43146042Swes i += 100; 43228021Sjoerg if (i < 0) 43328021Sjoerg return 0; 43428019Sjoerg 43528021Sjoerg tm->tm_year = i; 43628019Sjoerg 43728164Sache if (*buf != 0 && isspace((unsigned char)*buf)) 43828164Sache while (*ptr != 0 && !isspace((unsigned char)*ptr)) 43928021Sjoerg ptr++; 44028021Sjoerg break; 44148550Sobrien 44248550Sobrien case 'Z': 44348550Sobrien { 44448550Sobrien const char *cp; 44548550Sobrien char *zonestr; 44648550Sobrien 44752860Sache for (cp = buf; *cp && isupper((unsigned char)*cp); ++cp) {/*empty*/} 44848550Sobrien if (cp - buf) { 44948550Sobrien zonestr = alloca(cp - buf + 1); 45048550Sobrien strncpy(zonestr, buf, cp - buf); 45148550Sobrien zonestr[cp - buf] = '\0'; 45248550Sobrien tzset(); 45348550Sobrien if (0 == strcmp(zonestr, "GMT")) { 45448614Sobrien got_GMT = 1; 45548550Sobrien } else if (0 == strcmp(zonestr, tzname[0])) { 45648614Sobrien tm->tm_isdst = 0; 45748550Sobrien } else if (0 == strcmp(zonestr, tzname[1])) { 45848614Sobrien tm->tm_isdst = 1; 45948550Sobrien } else { 46048614Sobrien return 0; 46148550Sobrien } 46248550Sobrien buf += cp - buf; 46348550Sobrien } 46448550Sobrien } 46548550Sobrien break; 46628021Sjoerg } 46728021Sjoerg } 46848614Sobrien return (char *)buf; 46948614Sobrien} 47028019Sjoerg 47148614Sobrien 47248614Sobrienchar * 47348614Sobrienstrptime(const char *buf, const char *fmt, struct tm *tm) 47448614Sobrien{ 47548614Sobrien char *ret; 47648614Sobrien 47748614Sobrien#ifdef _THREAD_SAFE 47848614Sobrien pthread_mutex_lock(&gotgmt_mutex); 47948614Sobrien#endif 48048614Sobrien 48148614Sobrien got_GMT = 0; 48248614Sobrien ret = _strptime(buf, fmt, tm); 48348614Sobrien if (ret && got_GMT) { 48448550Sobrien time_t t = timegm(tm); 48548614Sobrien localtime_r(&t, tm); 48648614Sobrien got_GMT = 0; 48748550Sobrien } 48848614Sobrien 48948614Sobrien#ifdef _THREAD_SAFE 49048614Sobrien pthread_mutex_unlock(&gotgmt_mutex); 49148614Sobrien#endif 49248614Sobrien 49348614Sobrien return ret; 49428019Sjoerg} 495